【題目】All the factories are not allowed ______ the harmful gas into the air.

A. releasedB. releaseC. releasingD. to release

【答案】D

【解析】

句意“所有的工廠不允許釋放有害氣體到空氣中”。

allow doing sth“允許做某事”或allow sb to do sth“允許某人做某事”。變?yōu)楸粍?dòng)為be allow to do sth“被允許做某事”,故選D。

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